[SPARK-12644][SQL] Update parquet reader to be vectorized.

This inlines a few of the Parquet decoders and adds vectorized APIs to support decoding in batch.
There are a few particulars in the Parquet encodings that make this much more efficient. In
particular, RLE encodings are very well suited for batch decoding. The Parquet 2.0 encodings are
also very suited for this.

This is a work in progress and does not affect the current execution. In subsequent patches, we will
support more encodings and types before enabling this.

Simple benchmarks indicate this can decode single ints about > 3x faster.

Author: Nong Li <nong@databricks.com>
Author: Nong <nongli@gmail.com>

Closes #10593 from nongli/spark-12644.